Spa tub



FIG. 1 is a top perspective view of a spa tub embodying our new design;

FIG. 2 is an enlarged top plan view thereof;

FIG. 3 is an enlarged front elevational view thereof, all other sidesbeing identical thereto;

FIG. 4 is an enlarged bottom plan view thereof;

FIG. 5 is a top perspective view of an alternate embodiment of the spatub;

FIG. 6 is an enlarged top plan view thereof;

FIG. 7 is an enlarged front elevational view thereof; the rear viewbeing identical thereto;

FIG. 8 is an enlarged bottom plan view thereof; and

FIG. 9 is an enlarged side elevational view thereof; the opposite sidebeing identical thereto.

The ornamental design for a spa tub, as shown and described.